Design of a Hybrid Controller for the Three-phase Four-leg Voltage-source Inverter with Unbalanced Load

Van-Tuan Doan; Ki-Young Kim; Woojin Choi; Dae-Wook Kim

Design of a Hybrid Controller for the Three-phase Four-leg Voltage-source Inverter with Unbalanced Load

Vol. 17, No. 1, pp. 181-189, Jan. 2017

10.6113/JPE.2019.17.1.181

Hybrid controller

Resonant controller

Three-phase four-leg voltage-source inverter

Unbalanced load condition

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Abstract

The three-phase four-leg voltage-source inverter topology is an interesting option for the three-phase four-wire system. With an additional leg, this topology can achieve superior performance under unbalanced and nonlinear load conditions. However, because of the low bandwidth of conventional controllers in high-power inverter applications, the system cannot guarantee a balanced output voltage under the unbalanced load condition. Most of the methods proposed to solve this problem mainly use the multiple synchronous frame method, which requires several controllers and a large amount of computation because of frame transformation. This study proposes a simple hybrid controller that combines proportional?integral (PI) and resonant controllers in the synchronous frame synchronized with the positive-sequence component of the output voltage of the three-phase four-leg inverter. The design procedure for the controller and the theoretical analysis are presented. The performance of the proposed method is verified by the experimental results and compared with that of the conventional PI controller.

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Cite this article

[IEEE Style]

V. Doan, K. Kim, W. Choi, D. Kim, "Design of a Hybrid Controller for the Three-phase Four-leg Voltage-source Inverter with Unbalanced Load," Journal of Power Electronics, vol. 17, no. 1, pp. 181-189, 2017. DOI: 10.6113/JPE.2019.17.1.181.

[ACM Style]

Van-Tuan Doan, Ki-Young Kim, Woojin Choi, and Dae-Wook Kim. 2017. Design of a Hybrid Controller for the Three-phase Four-leg Voltage-source Inverter with Unbalanced Load. Journal of Power Electronics, 17, 1, (2017), 181-189. DOI: 10.6113/JPE.2019.17.1.181.